🛠️ Repo: Use JS-native Fetch API to get supporter data from OpenCollective

[hainenber]

Tooling Suggestion Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have read and agree to Mocha's Code of Conduct and Contributing Guidelines
• I have searched for related issues and issues with the faq label, but none matched my issue.
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Overview

Currently, docs and docs-next relies on external needle dependency to get supporter data from OpenCollective API. We can replace this with JS-native Fetch API to trim off a few dev deps. Pretty much a Chore one

Additional Info

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